恩斯特龙TH28直升机防治杨树食叶害虫试验

运用恩斯特龙TH28直升机喷洒森得保飞防专用药防治以第三代杨小舟蛾1～3龄幼虫为主的杨树食叶害虫,其药剂用量为37.5 g·hm-2.结果表明:地面测定恩斯特龙TH28直升机的喷洒覆盖率达91％,GPS测定喷洒覆盖率89％,二者基本相符；平均雾滴直径为83.7 μm,在喷幅30 m内平均雾滴密度为13.2粒·cm-2,...

Application of Engstrom TH28 helicopter in control of leaf-eating insects of poplar

Using Engstrom TH28 Helicopter sprayed the Sendebao drug （37.5 g·μm-2） to control the lst-3rd instar larvae of 3rd generation of Micromelalopha troglodyta, the results indicated that, the spraying coverage in ground determination was 91%, which was in accordance with that of GPS determination （89%）. The average droplet diameter was 83. 7 μm, the average droplet density was 13.2 grains per square centimeter, the effective width of the spraying was 30 m, and the uniformity of droplets was 0. 65. After 7 days from the control, the rate of population reduction reached 80%. The Sendebao drug had little effect on the number of natural enemies, such as mantis, ladybug, ant, spider and so on. In the egg and larval stage of 4th generation and 5th generation, and the larval and pupal stage of I st generation in the following year, the population of M. troglodyta in experimental area was significantly lower than that in contrast area, so the sustained effect of controlling the insects was obvious.